Extract Function: Treat multi declarations as local variables

#KT-5054 Fixed

idea/testData/refactoring/extractFunction/parameters/misc/multiDeclaration.kt.after

@@ -0,0 +1,11 @@
+// SIBLING:
+fun main(args: Array<String>) {
+    val (a, b) = Data(1, 2)
+    unit(a)
+}
+
+fun unit(a: Int) {
+    a
+}
+
+data class Data(val a: Int, val b: Int)